Puppet users - May 2014 - Puppet update to 3.6.1 causes Error 400 on SERVER: no 'environments' in ...

After upgrading to Puppet 3.6.1 I get this error:

Warning: Error 400 on SERVER: no 'environments' in 
{:root_environment=>#<Puppet::Node::Environment:0x7f7453299a90 
@config_version=nil, @manifest="/", @modulepath=[], @watching=true, 
@name=:"*root*">, 
:current_environment=>#<Puppet::Node::Environment:0x7f7453299a90 
@config_version=nil, @manifest="/", @modulepath=[], @watching=true, 
@name=:"*root*">} at top of [[0, nil, nil]]

Any ideas?

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